I WAS HAVING ISSUES WITH A PRIOR RECALL, CONCERNING THE CATALYTIC CONVERTERS AND OVERHEATING. (POTENTIALLY LEADING TO A STALL / ENGINE FIRE) I TOOK MY CAR TO THE SHOP AND WAS TOLD THEY HAD RAN THE UPGRADE AND MY CAR WAS MECHANICALLY SOUND. THROUGHOUT THE FOLLOWING YEAR, I HAD CONTACTED KIA OVER MY CAR ACTING STRANGE AND NOT ALLOWING ME TO ACCELERATE WHILE GOING DOWN THE ROAD ON SEVERAL OCCASIONS. THE CAR MAXED OUT BETWEEN 25-35 MPH ON MAJOR HIGHWAYS 4 TIMES TO DATE. I KEPT TAKING IT IN AND THEY DONE INSPECTIONS, THE CAR APPEARED IN GOOD MECHANICAL SHAPE. EXACTLY 2-3 DAYS AFTER PICKING MY CAR UP, IT STALLED ON ME AGAIN, RESULTING IN 3 SEMI TRUCKS ALMOST COLLIDING INTO ME. MY SPEED WENT FROM 75MPG DOWN TO 30MPH ON A 70MPH INTERSTATE. AFTER THE UPGRADE, MY ENGINE WOULD RANDOMLY START MAKING A CHIRPING SOUND / TICKING SOUND. SEVERAL MISFIRE CODES PRESENTED THEMSELVES THROUGHOUT THIS TIME AND YET NOTHING WAS FOUND STORED IN THE CARS COMPUTER. KIA STATED IT WAS RECALL RELATED AT ONE POINT AND WHEN THE ENGINE STALLED THE LAST ROUND, THE ENGINE AND CAR STARTED SHUDDERING DOWN THE INTERSTATE AND NOW THE ENGINE HAS A LOUD KNOCKING NOISE COMING FROM IT (THREW PISTON / ROD) AND KIA WILL NOT ASSIST IN THE INSPECTION OF THIS SAFETY RECALL ISSUE. KIA HAS HAD ME PAY SEVERAL TIMES FOR INSPECTIONS AND TOWING TO DATE. HUNDREDS OF OTHER OWNERS HAVE EXPERIENCED THESE PROBLEMS AFTER THEY RECEIVED THE ECU LOGIC UPGRADE AND ALSO PRIOR TO RECEIVING IT. KIA STATED THEY WERE NOT EXACTLY SURE AB